Risk Evaluation and Disaster Mitigation Research Division
Oceanic, Atmospheric and Outer Space Disaster Lab
Research Subject(s)
I have investigated characteristics of solar highly energetic particle events which are critically dangerous for human activities in space and upper atmospheres and have examined their early prediction methods by ground-based solar radio observations using the large antenna and high time and spectral resolution receiver named AMATERAS/IPRT at the Iitate observation site, Tohoku University in Fukushima.
Key Words
Solar Plasma Physics,Space Weather,Planetary Magnetospheric Physics,Radio Observation
Research Activities

When extreme solar explosive phenomena (flares or so) occur, many solar energetic particles (SEPs) are occasionally generated. If a SEP event occurs with its maximum magnitude, the radiation dose is estimated to be 1Sv at a space station altitude, which gives serious damages for astronauts and artificial satellite electronics. Therefore, early prediction of SEPs is an important subject in the space disaster science. It is known that some particular radio bursts are emitted simultaneously with large SEP events. Since radio waves can propagate faster than SEPs, we have been trying to observe the particular bursts for the early predictions by the development of new radio observation systems.

Selected Works

Kaneda, K., H. Misawa, K. Iwai, S. Masuda, F. Tsuchiya, Y. Katoh, and T. Obara (2018), Detection of Propagating Fast Sausage Waves through Detailed Analysis of a Zebra-pattern Fine Structure in a Solar Radio Burst, Astrophys. J. Lett. 855, 2,

Tsuchiya, F., H. Misawa, T. Obara, K. Iwai, K. Kaneda, S. Matsumoto, A. Kumamoto, Y. Katoh, M. Yagi, and B. Cecconi (2018), Database of solar radio bursts observed by solar radio spectro-polarimeter AMATERAS, in Planetary Radio Emissions VIII, edited by G. Fischer, G. Mann, M. Panchenko, and P. Zarka, Austrian Academy of Sciences Press, Vienna, 445-453, doi:10.1553/PRE8s445.

Iwai, K., F. Tsuchiya, A. Morioka, H. Misawa (2012), IPRT/AMATERAS: A New Metric Spectrum Observation System for Solar Radio Bursts, Solar Phys., 277, 2, 447-457,

Selected Memberships
  • The Astronomical Society of Japan
  • Society of Geomagnetism and Earth, Planetary and Space Sciences
  • Japan Geoscience Union
  • American Geophysical Union